How to delete iPhone data permanently?

How to permantently delete data on iPhone?1. How I delete data permanently on mobile phones?
I want to sell my mobile phone so I want to delete all my contacts and photos from my mobile permanently .How i delete all that cannot be recover by any data recovery software? I want to format the memory card but how? what software will be used for this purpose? - Zainab Fatima

2. How do I stop someone from using iPhone data recovery?
Long story short I contacted my cousins while our family is in the middle of a kinda civil war on my Iphone 3. I deleted the texts but my parents said they are going to do iphone data recovery on my phone to see all the information I've ever had apparently. I don't want anyone to get in trouble, is there any way to stop this information from being accessed. Or perhaps a way to delete them permanently? - Andrew

3. I want to completely delete all data from my iphone?
Is there any way to delete every activity from the phone and sim card so that if I print out my phone bill none of my history or web activities or phone call/ messaging history will show? Is there any way to prevent my activities from showing on the phone bill? I have an iPhone 4 and I'm on T-Mobile - Elloello

4. Delete entire SMS history from iPhone 5?
I noticed that my deleted SMS on iphone 5 is still stored in the phone. How do I Bauer that deleted messages are completely deleted? - Ruchird

Maybe you know the way of using the default erase setting built in iOS, but it doesn't really erase your personal data. In fact, Apple only encrypts the whole data on your iPhone instead of erasing it. With a special and powerful recovery tool, the data can be fully recovered from your iPhone. So, in order to protect your personal information and delete data on your iPhone permanently, need a third-party data eraser, here recommend the Wondershare SafeEraser. With it all data on your iPhone can be really deleted forever. No matter which data recovery software you use, you can find nothing on it.

Wondershare SafeEraser works great for iPhone 5S, iPhone 5C, iPhone 5, iPhone 4S and iPhone 4. You can download it below:

Step by step to delete iPhone data permanently

Step 1. Connect your iPhone to the computer
Launch Wondershare SafeEraser. Then choose Erase All Data and click on it.

Step 2. Choose a Level to erase data
There are three levels of data erasing for your choice. You can directly use the default one (medium), which will overwrite your iPhone with junk files to ensure that the files are not recoverable, and no one knows that you've deleted all data on your iPhone. What they can recover from your iPhone are all junk files.

Step 3. Start to erase all data on your iPhone
Here, let’s choose the medium one. Then click on the Start button. To make sure that you've backed up your important data and still want to move forward, you need to type a word shown you in the input box and click Confirm. Now, the program begins erasing all data on your iPhone as shown below.

Step 4. Use your iPhone as a new one
When your iPhone is erased completely, you’ll get a totally new device. You can set it as a new iPhone.

You should consider the following situations to delete iPhone data permanently:
1) You want to resell your old iPhone prior to getting a new one.
2) You need to return your iPhone, iPad or iPod touch to the company.
3) Your iPhone is jailbroken and it’s always stuck in an infinite loop when you use the ‘Erase All Content and Settings’ to clean the data.
4) You’ll have to send your device back to the factory or retail store for a repair.
5) You’re an environmentalist and wish to donate your old mobile to a recycling program.
6) You wish to prevent unauthorized access or unknown people from retrieving or viewing sensitive data on your device.